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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c9e28c24d5c6ae0b250f5320324621d46a4758936d71a2699b7f264ed7ba52' 
  AND token = '/U2m7nUBYPUUA6+8Ri5E8pQbZ9i0kmg/N7GKGNEpmVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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