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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3bdb2de4d1100aef9d00cf04ac1506b9aefe5bd25ffef2dadd3337caa4e099' 
  AND token = '3CNLD01MLjcy0/C5Kskh0He5G03lVbwqwqsoc0A58Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00117

JSON explain

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