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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c535ff119734a2815d63cc470f6a6296dd7a26d55d934a6bb1ac5d0ad295c3' 
  AND token = 'rFPJAAWMAZb64CN7wNYnhI5lFMmDExfEa7zK5stBhuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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