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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c80744c2c7ca074cffa644ef642d364acdeadb186a3eeb542dc2e6155d140f' 
  AND token = 'Q3AFgyX339BRqc2m30uzngfw4hwmO4rASBveqveMSs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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