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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b42c4d59e7c7992856b957d2bfe499e9d562bc49c04d50e11f327e31492427' 
  AND token = '/rnpxxCZYt09LzehAwcNWAZoepXR2U+xmyo/0eXwDt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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