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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f461c17b3a8bd8dfd5b20e9e6bd84989df9a0e99bc70fd1ec1029fbdfb8687' 
  AND token = 'dp3nrMroZAiyQZNtn1qiGtbiNaO09DCYz1wNfeB3Ljc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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