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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd936b817190dd58e1c2d6f807148b7035384128b744aaf2f3852cd77227cbe42' 
  AND token = 'sq7k2o0TJm5ep7gnWXLYxhx3YjoO8wnDiazwSRAoq4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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