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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08bbcee29091ddd3b3804639fbf557eb0542647d0d759f78d0215ff5108693a' 
  AND token = '+3DLENcLQf9tKOSUXUV4XYD/4CNhSbfVKRWnbi6hQZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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