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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d4f4dd0d458b2d515860184526e9444d6988454b7da5b19e0e37d4945ee06e' 
  AND token = 'OClDoA9hBOhkpQK1NA9iPSIFEjIukrHYT+798MHwz0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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