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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e0feca0f56763799ee825ed66a3defa96dc2f0ea06bfca5604534fb4cd0cace' 
  AND token = 'y4sQcPDdED9C9ojIUoYa3WuFv2bLquHYy477rttgRl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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