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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f4bceae45b07be95155b90d6a800238164c957cf900f197de3a6a3e802ba627' 
  AND token = 'vsKEbrJ+ncmXUx4omQVCx2BxYYxBDkEmigU3D4QE7h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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