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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f30cbce3958d7fa4509decb2e7b6ebebfcd15821d635e9a3b2fbf21a81fe00' 
  AND token = 'iP+iZriYWL43pY7ay4wpFUFCY1Pi2urr8ZKVJUJf88k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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