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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c943de77b38cb37839d596285a0763a28c8d4b8ec14519a935b9fd1dbbf09435' 
  AND token = 'kEq62/G072eU3KeizADQqjUT5ckFzllp0Tsyxbry1vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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