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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9863526fa35a59e9fae52419724b4a576f3407c20719d22dc7dad4e3b2dd0b8' 
  AND token = 'hR8unNcqr1mrNsEbRgF7yYB0mm5j2JotKQUH6T46yvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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