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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0354a1c8f6f23a19103e89e846c146432bb5394faee7ade9c334c6e91ca23e' 
  AND token = 'hDnfNFbw0yG5fhTQ5yktUltnJWlZBIXv2LX7TBuomx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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