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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e1c09c7ec578ec38c75cff3fcca8c60faf952d0267610d0709541cb609e688e' 
  AND token = 'BegWO+uMS9lEak2/eNT50bobzJS4uQAyrxGXuhZ65Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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