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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5d967d5cd8c2d0af4300a5191ffd8f8c189ae16a5d9233bdf76c9d72e29356' 
  AND token = 'PsxlAlzIeMENObT6FuojmlrE244dFHGd2vM3fOQBpb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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