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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e411ca37786e8e09f46f0e2b95a529f88acb49d46ef3438555a4e45635aa4d' 
  AND token = 'RarKLRK3kylEQ5whoimbRfZf4J6aP5dsFlv7hTbWMwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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