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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b5a07cd45e3d571b2fa3006ed98c66218498073503193e4f8ddb290ab355ec' 
  AND token = 'ar2xQ/uKlM8zJNQaoBj/XzOETkwrUV+Jr+a0Mn48wlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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