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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0fa6b92d75e9a0b66bb6ae0af676c6f799746d0cea6ffc04f6162aa9719e72e' 
  AND token = 'yu6vPgiKhB/lCG6ZrDOxtrSUKOwHfDtqETlNsmjRPvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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