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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c319b78e1707a4b291b5fe859f3d00d2229755c1a3fb17f23b173914ad14cb74' 
  AND token = 'Do30tQkwQJ8PhdzbrSaJwCfDSErQj3AVNsAbyw7/Leo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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