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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08129c898145a9d0a439bccf96712aba2b0c037175b9075739a3cf0a14faeded' 
  AND token = 'X5T5Ik4Lcn1dOvAF2fW5XxVxyg3EzURmn4oXfJTjCSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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