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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d51247388c2d74765d1d38e25d4c748999c25a931eb90a0d6718ad6a06cab2' 
  AND token = 'mqSgLPiBE+Roul6IuuqpiHQOFSOV2OF41nvdz875j28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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