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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd436c2532a34661571f6edcf0469494f50ff0cda8a426443dd3d5fac4bb639d1' 
  AND token = 'mJoPMAlnHuEq5HAh7E+Km3KDiouR8y3vYrtC3cgzuXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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