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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766c767daa3d5450d8de9f355f35612692ccd0266c5c117b9ae62014c662e22a' 
  AND token = '3LFYMWdLbz4wwU9KLAkCmlwbbxFksMVVsF2NngSvPxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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