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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c6a38e98c5c1651effd38289db59cca3bbe1c2cdfb6ef806aba6e8e159de71' 
  AND token = 'amT8eH0fHfiKVEm55hLtS6d75Err3vzxksswt+iFaao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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