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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b574c530631e3a9cb6bd390fd48559270b559a6512ced3b8fbc744757d3a2e' 
  AND token = '5VHNL23Orz5T5A/MCRI7GBhUj3B1I3hNx83JyUIg8ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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