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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3d4cb79115b8426dc80ad559e5e85c96c6a3943d9e9236414c6cca112084e4' 
  AND token = 'Iy5+GCPemLPUnLmjO2Z4wSLJ3LehTamrmimEOMwhW6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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