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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ef09456d9b9a62cb301eec170b8989248e3a5e97af407f80a53da477d5b8315' 
  AND token = 'UKYI88MuCg94ncDjvXM74CcFmihocsRGVQP9mYkJ/ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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