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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '148ab8136772a48ad9a672553a3d15ce4c0b3807ae8237075f12cb873e11e5ab' 
  AND token = 'TkeqS1pflirK39Hk3Ws05vDvdJv9L58ddDh9b1GmGL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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