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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7f3a10d721e64dc9efb0427b3708a8ba6fb02271e83fef6a5f5438ffe567aa' 
  AND token = '3sYKtKwPolmF9FgRRlS6oCqy9UitpmiD4CNyI5KGIBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}