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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b22af34e4f0c93fad3399e222936e48e057fdba3828bc4bbdb2032703f802a' 
  AND token = 'LnG9lYdZbeWBuf85sCSH4ktY4cYrutBU7TlA4WdPNRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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