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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd605035d1808e4ba6262cdf5df82f7709dea40f6c3c2484f3497afdeadb93aa5' 
  AND token = 'pI85aePS20bAciMj3TvvTGOpXwPkdksw3bGQTXbo6d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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