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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c8f9c4fa9608c3437fce2a3540d29bbb0de62c51a45c32deb5277c2e7145cc1' 
  AND token = 'C0fIq8T5NM7lUgvxkYHvomhygEyzeUhE9/jZy7QLONU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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