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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1116e7869a98f8d7634269719c92e2b1513137f905e11814932c36a431809787' 
  AND token = 's8TyAZSVnlfv2SCo5Zl0v3/uCEVyzfTfAHbPJTNdCio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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