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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '162c256f6f11371726367c8121a8b92fcfd04f3a5f7ad6203844a5b3b856c7a5' 
  AND token = 'knHqmuNHf0U2cJdr+QyT9NogpylOWswMSRtxjjK0Bpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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