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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f66a860ca6b92c0ecf755d47e5700e993270c9d375804807d2a635b2e0cb0b96' 
  AND token = 'yeAH/2EVMyZJVcO/ypOWihyoNLiAU3nT4TJMBC1t4os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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