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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698d6b5e55352e62968912467cde84db5ab7e2cd2cbdb25bb2ea054dbdce0dc2' 
  AND token = 'fZdR2fsb4SV3mitVIlzfE2sNLX1ajJ0YYqzCDmxocyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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