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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd6276632c916906b6778cc7e9d0841c138172dce0d74be11f724a9c30c4d000' 
  AND token = 'e2fG3GKKLORQM94XFKn2WqrtbauTjzJr0qXqLNvrkmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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