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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9dc776f9a77aa012a8fb5611f4fcf53732e8ae4583b9fe6ec9559be7bbae59b' 
  AND token = '9rn/S26hSIk2fk5kgBteAUVGeFauMM87bFzF8cat3nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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