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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c60c75c777e12ef1480088899181c1c74263dab6f086c84aa78a08b77f35cb' 
  AND token = 'HCe795TxlKOa6cTIPuQHpItb3pPhJbc5eb9td7FF9x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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