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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c99ad0cedfd2984687b59970fe3b84619be8b26073d836e833ec81e33c5cd6' 
  AND token = '3yBoDrcQaw7cTJIdCqA8TkJAZsxlpZ/Z0Aj99Y83Qts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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