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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef82f061329f2b1db07f3dbadd9196eef8d4c4ae56e59433bf7d6ca77ae0465' 
  AND token = 'x4WD9fpSQcvxZdbLJb1OcowG228VLzndFrGYbrVaKg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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