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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '006fc05859f6aa9059e86d2d9f3e3e74544b2a0e5dd50342a2819104604c3fb0' 
  AND token = 'fKT9MGZA+0O04KYEjoC7zOQnJJ/x/6Xv4XfOm5nig68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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