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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20b8e3fc88d36ad2a0cd0eea7cb9c9a5d1f90334330dcbf54a957d13fdd210b9' 
  AND token = 'khivkx0HNUB6R0H6O8oY/YitUJJaKHK3wiROpd8WE2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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