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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b304679056cf81ca71d0ff2ba424bd10cf8f886eef883c17658f8333cedf653a' 
  AND token = 'JuI8MaQksXh9oBqDzPUImJQf+ysDtVdnm9foWzGtnow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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