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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d4b40929c590bc6c6263d1b9b333b2550770cd241b263612eab2219659e94b9' 
  AND token = 'qAscv3ZfCAeZt2IMZkh1lhfg0IV4OtCwJ+qj/EoAOQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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