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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e65c261a5230e7972d4db6c132d3a44f3b1e0f5f0c4dc44da12f56ba9c0d1a5b' 
  AND token = 'QyoB9eERbmm4j6c8ZwjJzP416Ty4z6yJ+Evkm7ytTPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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