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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c75877cde522d69482d42cc079b75510310b22ba3d720bad52c2584ec742cab9' 
  AND token = 'brnv0ughSFURewSfMzNzJvV1Aq6bS3P0HofF9B1Yp+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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