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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0034acb13abf5bfee93e8d127d3005db9e542e3a3250f12495ab8ab6f7daa964' 
  AND token = '8iIko+HhdvfXutdgeHPO0SbZNXvidqe6gvoPTs3g07c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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