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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3dad26d80f2a41a5bfc4ba74168f711de74ceac6cb15e2a735fd2e6cfa2c6bd' 
  AND token = 'aox7cW+a13GN5Ig4QQCHz8hdcbQO8GrreguBIZoyX4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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