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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35fa85f7d68de584c3be84e550b950ef89345ef1bcbf137d660b088624e01ae2' 
  AND token = 'D4w3zxqwbFIYJfBJqF9PWQ8rxwkirIBLwrzWcMfUYcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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