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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01a8dcda4ecba392c0a643087782af1aa16bfa75e487f4a2b94faa77c9620c52' 
  AND token = '7IpiWORsDk7HLpJ7X0c0Z69amR/wfSi8mfbmCVfDLWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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