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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920e43781d21f156def25d22ca54fe44c4488c9c497cf42cd283d3f0037ffd3c' 
  AND token = 'kaRc09Pwnykq7FLwQ5n9/f0VP0fOn2agts0P1n6zDjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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