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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f70cb590780915232980df8b6fde4ddfe756664f4ca8599bd8af5a2992ba45' 
  AND token = 'vYqkQUd4uN7ymMaq8sXNSSabbpCRnbOyg8CKItu9Kx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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