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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f7c0c6f24884cfbecadde79e88cd9b604705ebe88ed8d91f1766474090b1e9' 
  AND token = '73TA7JTWJc1+dVYof8dUpfCGnYlOC4bKMmRiPhBxQSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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