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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44ef2e7c80d5d499fae05bcf7981242d33baaf8bf76efb899bd7964e4be5e4af' 
  AND token = 'ViJDqi/XZ4HGZ7OLGe5SnCHdc6FYO5xxJ592+wXNAcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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