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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c38d69ad09bbdf171e86cd18f9c0cd39dd4d097fb2692a8e6423169b77a17c4d' 
  AND token = 'Aqr65h8c9r+SoESK92+lIYZi7c+QUQM6rhB4VpxgVWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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